Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16b3f2048ea5df5…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 09:02:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 49b47409b73bc8121c95056bd75ca3d6 SHA-1: e231ac60819030e9ece8e835f4aea8b86a26f180 SHA-256: d16b3f2048ea5df51e48370a399957ce1c82eb6ac71e019dcb5dbd692543f207
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and generators. The primary link, https://netcdn.online/app/431946152/free-roblox-hair-to-wear-game-hack, is identified as a malicious redirector. The document body and embedded URLs suggest a lure for users seeking in-game currency or cheats, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/431946152/free-roblox-hair-to-wear-game-hack In PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-trolling_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/pokemon-go-free-codes_GM1094591345.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/rbx-website_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/microsoft-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000504c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x504C 25664 bytes
SHA-256: 8d9cf28fc245e1ec7120ca86531c1c235572f4610279e7f7450f353c9911ad71
font_01_sfnt_off00008bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB9 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000098ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98CA 18496 bytes
SHA-256: adf075a740c6f928a3b94d4aeef99adcd15710aa40e26859f6513b600edf11fb

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